The objective of this study is to evaluate the performance of colorimetric assays for the detection of M. tuberculosis complex from sputum samples from adult pulmonary TB suspects in a high TB and HIV prevalence setting, using Löwenstein Jensen (LJ) and Mycobacterium growth indicator tube (MGIT) culture as gold standard. The colorimetric methods evaluated here will be the solid medium-based nitrate reductase assay as described (NRA) or with an additional step using para Nitrobenzoic (PNB) acid for differentiation of MTBC and NTM (NRA-p), and the modified resazurin microplate assay, also using PNB for differentiation of MTBC and NTM (REMA-p).